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Write-Downs of Long-Lived Assets - Long-Lived Assets and Liabilities Associated With Those Assets Classified as Held for Sale (Detail) - Discontinued Operations, Held-for-sale - Real estate properties and transportation equipment - JPY (¥) ¥ in Millions	Sep. 30, 2025	Mar. 31, 2025
Long Lived Assets Held-for-sale [Line Items]
Investment in operating leases	¥ 68,844	¥ 7,230
Property under facility operations	0	15,217
Office facilities	0	3,558
Other assets	10,558	22
Other liabilities	¥ 0	¥ 221

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